6.3-20.5mm Countersink Set DIN 335C 90° 3-Flute HSS-Co 5, Plastic Case - Ruko GmbH

Take advantage of precise chamfering and deburring with durable HSS‑Co 5 cutters and a standardised 90° countersink angle for consistent results across a wide diameter range. Combine robustness, easy storage and conformity to DIN 335 C for reliable workshop performance — order the countersink set directly via Metav Werkzeuge or consult our advisors if needed.

RUKO Countersink Set DIN 335 C — 90° HSS‑Co 5, 6‑piece

The RUKO countersink set DIN 335 C is a compact workshop solution for producing clean chamfers and deburring holes in common machining tasks, presented in a robust plastic cassette for safe storage and transport.

• DIN 335 C standard
• Three cutting edges for smooth finish
• 90° countersink angle
• HSS‑Co 5 for increased wear resistance

Reliable chamfers and repeatable results for everyday machining

The set is engineered to deliver consistent chamfers by combining a standardised 90° geometry with cutters manufactured from HSS‑Co 5, a cobalt‑alloyed high‑speed steel that improves hardness retention at elevated temperatures. Conformity with DIN 335 C ensures compatibility with established production practices and simplifies quality control. This results in fewer rejects and a more predictable fit for countersunk fasteners and assemblies, supporting steady production flow in both repair and fabrication environments.

Smooth cutting and reduced rework from three cutting edges

Each cutter features three cutting edges, a design that balances cutting stability and surface finish. The multi‑edge geometry reduces vibration and produces a neater chamfer compared with single‑edge tools, lowering the need for manual deburring afterwards. The set covers a 6.3–20.5 mm diameter range, enabling selection of the correct cutter for different hole sizes and helping to maintain uniform chamfer widths across batches — a practical advantage for parts that require accurate seating of 90° countersunk screws.

Robust organisation and protection in the workshop

Tools are supplied in an impact‑ and break‑resistant plastic case, which keeps the cutters organised and protected from knocks and contamination. The cassette format aids tool tracking and minimises downtime caused by searching for the correct cutter. Clear labelling within the case supports rapid selection at the bench and contributes to tidy workshop practices, improving throughput by reducing interruptions during machining tasks.

Durable materials and straightforward maintenance extend tool life

Manufacture from HSS‑Co 5 provides a balance of hardness and toughness suitable for routine countersinking operations. The cobalt alloy contributes to heat resistance during higher cutting speeds, which helps preserve edge geometry and prolongs service life. Routine inspection and basic sharpening restore performance where appropriate; when replacement is required, the modular set simplifies restocking and keeps inventory predictable for purchasing departments.

For dependable chamfering performance with the RUKO 6‑piece countersink set, contact Metav Werkzeuge in Emmerich for ordering or expert advice — info@metav-werkzeuge.com • +49 2822 7131930

Technical data

• Article number: 4000601499NW
• UID: 4000601499NW
• Description: Countersink set DIN 335 C, 90°, 6.3–20.5 mm, HSS‑Co 5, 6‑piece, plastic case

Facts

• Countersink angle: 90°
• Cutting edges: 3
• Size range: 6.3–20.5 mm
• Pieces: 6
• Standard: DIN 335 C

Special features

• Material: HSS‑Co 5
• Packaging: impact- and break-resistant plastic case
• Brand: RUKO

FAQ

What sizes are included in the set?
The RUKO countersink set includes cutters covering a diameter range of 6.3–20.5 mm, supplied as a six‑piece set to accommodate common hole diameters for countersinking and deburring tasks.

What is the countersink angle and why does it matter?
The cutters have a 90° countersink angle, a standard geometry for many flat countersunk screws; this angle ensures correct seating and load distribution when producing countersinks to match standard fasteners.

How does HSS‑Co 5 affect tool performance?
HSS‑Co 5, the material used for these cutters, contains cobalt to improve hot hardness and wear resistance. The RUKO cutters retain cutting performance longer under heat‑generating conditions than plain high‑speed steels.

How many cutting edges do the cutters have and what is the benefit?
Each cutter has three cutting edges, which promotes smoother cutting action and improved surface finish compared with single‑edge countersinks, reducing the need for secondary finishing.

Is the set easy to store and transport within the workshop?
Yes—the set is supplied in an impact‑ and break‑resistant plastic case, designed to keep tools organised, protected and immediately accessible at the bench.

Manufacturer/Responsible: Ruko GmbH Präzisionswerkzeuge; Robert‑Bosch‑Strasse 7; 71088 Holzgerlingen